Hi,
Im running Ubuntu 10.04 Lucid .I had enabled Administrator(sudo) Priviledge for few users.How can i Log the history & Commands executed by Sudo users.Whether its possible .Any help to find out the answer .

You can view a comprehensive list of /etc/sudoers file options by issuing the command man sudoers.
Using syslog To Track All sudo Commands

All sudo commands are logged in the log file /var/log/messages which can be very helpful in determining how user error may have contributed to a problem. All the sudo log entries have the word sudo in them, so you can easily get a thread of commands used by using the grep command to selectively filter the output accordingly.